Backwash fitting



FIG. 1 is a perspective view from below and to the right front of the backwash fitting;

FIG. 2 is a side view of the backwash fitting, wherein the opposite side view and top and bottom views being the same;

FIG. 3 is a view of the backwash fitting from the left of FIG. 2; and,

FIG. 4 is a view of the backwash fitting from the right of FIG. 2.

The circular area inside the broken line of FIG. 4 forms no part of the claimed design, and the broken line in FIG. 4 is included for the purpose of illustrating portions of the backwash fitting and forms no part of the claimed design. 

CLAIM The ornamental design for a backwash fitting, as shown and described. 